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Nice whistle, but I am having grief getting a non-porous structure. I have used up to 40% infill but still porous. I am using a prusa/mendel printer, Slic3r & Repentier to run it, I use a 0.50 nozzle and layer height of 25, and am using PLA 1.75.

Anyone have any suggestions? If I wrap whistle in tape to seal it it works great, but its not the solution.